Which is one major reason that OS/2 withered - it did such a good job running Windows program that nobody saw the need to actually buy OS/2-native programs... If Apple undertook a similar strategy, it would probably be the last straw for many Mac developers...

Except that Windows didn't suck nearly as much back then as it does now as far as security is concerned. There wasn't an issue with the hack-my-box-so-it-can-be-a-slave, always on internet we have now. There seems so be a rising disgust with the crapware that MS is putting out, Longhorn delays, and the worry that when it does come out that Longhorn won't be as good as it should be.